 If you liked
Yokohama Kaidashi Kikou
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 ...then you might like
Hoshi Tabi Shounen
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One of the few mono-no-aware manga that has come close to the same hopeful, resigned melancholy of YKK, with a sci-fantasy setting, a male MC, and a bit more plot. Features well-illustrated backgrounds, interesting lore, and an atmospheric space setting.
Also, the author of Star Tripper was directly inspired by YKK, and has even interviewed Hitoshi Ashinano, the author of YKK.